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Re: [Phys-l] computers

My tech guy also said it is best to charge the battery to 100%, unplug,
use the computer, and let the battery drain to nearly 0%, then recharge
again. He said this will extend the battery lifetime, rather than to just
keep the plug in all the time, or to not let the battery completely drain
before recharging.

Thoughts?

That's a myth. It's a legend handed down from the days of NiCd
batteries that had bizarre memory issues. Those days are long
gone. Laptops don't use NiCd batteries anymore. And FWIW modern
NiCd batteries are much better behaved.